[new] Tests for now/at/getitem
[fix] Fix  code
[new] Test for
[new] Test for _remove_duplicates
[new] Test for _add_
[new] Test for inc
[new] Test for end
[new] Test for raise
[new] Test for both
[new] Code cleaning
[pep8] Fix E128 warning
[new] Omit tools.py from coverage
[new] Test for unicode
[new] Test for eq
[new] Test for eq
[new] Test for clone
[pep8] E303 warning fix
[fix] PY2 test before unicode()
[new] Test for multiple calendars
[new] Test for init with int